Ethel has summed up the legal position very well. Unless the court accepts 'special reasons' for not imposing a ban and/or ordering an extended driving re-test, the court must impose a minimum ban of 12 months (and require an extended re-test) for any conviction of dangerous driving. (It's extremely difficult to persuade a court to accept 'special reasons' for not imposing a ban. The potential loss of your job would not be regarded as meeting the criteria).
Your only hope would seem to be to seek the services of a good solicitor to see if he/she can persuade the CPS to drop the charge down to 'careless driving'. The legal definition of 'dangerous driving' is as follows:
"A person drives dangerously when:
The way he drives falls far below what would be expected of a competent and careful driver
AND
It would be obvious to a competent and careful driver that driving in that way would be dangerous"
http://www.cps.gov.uk/legal/section9/chapter_b .html#13
The definition of 'careless driving' is this:
". . . when the accused's driving falls below the standard expected of a reasonable, prudent and competent driver in all the circumstances of the case"
http://www.cps.gov.uk/legal/section9/chapter_b .html#19
Your solicitor
might be able to persuade the CPS that the lesser charge should be applied (or he/she might be able to convince a court to convict you only of careless driving) but that would depend upon the exact circumstances of the offence.
Chris